Trim the Fat | 217
Performance
Put your PC to sleep
The key to using Sleep or Hibernate is to set one of them up as the default
action to take when your PC would otherwise be shut down.
Now, regardless of your settings, you can choose to sleep your PC??”or for
that matter, shut down, restart, or log off??”at any time by clicking the tiny
arrow next to the red button in your Start menu, as shown in Figure 5-2.
But to change your PC??™s shutdown settings, open the Power Options page in
Control Panel, and click the Change plan settings link under the currently
selected plan. Next, click the Change advanced power settings link to open
the Advanced Settings window, and then expand the Power buttons and lid
branch (Figure 5-3). If necessary, click the Change settings that are currently
unavailable link (see ???Control User Account Control,??? in Chapter 8,
to get rid of this last step).
What is hiberfil.sys?
To avoid some of the drawbacks of Vista??™s Sleep power-saving mode, you can
hibernate your PC. As described in ???Start Windows Instantly (Almost),???
Hibernate saves a copy of everything in your PC??™s memory (RAM) onto your
hard disk before it shuts down.
Windows uses the file hiberfil.sys, stored in the root folder of your hard disk,
to hold your hibernation data. Because it must hold everything in memory, its
size is the same as the amount of installed system memory. Have 2 GB of
RAM? You??™ll see a 2 GB hiberfil.sys file on your hard disk that Windows
won??™t let you delete.
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